15,528 research outputs found
Photoluminescence and excited states dynamics of Tm<sup>2+</sup>-doped CsCa(Cl/Br)<sub>3</sub> and CsCa(Br/I)<sub>3</sub> perovskites
No full textIn this study, we systematically vary the Cl/Br and Br/I ratios in CsCaX3:Tm2+ (X = Cl, Br, I) and hereby gradually shift the positions of the Tm2+ 4f125d1-levels as relative to the two 4f13 levels. At low temperatures up to five distinct Tm2+ 4f125d1→4f13 emissions and the 4f13→4f13 emission can be observed. As the temperature increases, most of the 4f125d1→4f13 emissions undergo quenching via multi-phonon relaxation (MPR) and at room temperature only the lowest energy 4f125d1→4f13 and the 4f13→4f13 emission remains. For all compositions a 4f13→4f13 risetime phenomenon is then observed whose duration matches the 4f125d1→4f13 decay time. It shows the feeding of the 4f13 state after 4f125d1 excitation. Surprisingly, the feeding time becomes longer from Cl→Br→I, while the related 4f125d1-4f13 energy gap becomes smaller. The temperature dependence of the 4f125d1→4f13 and 4f13→4f13 emission intensity shows a anticorrelation as earlier observed in other systems and confirms that the feeding process is thermally stimulated. However, the thermally stimulated activation energies that control the feeding process, increase from Cl→Br→I despite our observation that the 4f125d1-4f13 energy gap becomes smaller. An analysis reveals that the unexpected behaviour in risetime and activation energy, as a function of composition, cannot be explained by 4f125d1→4f13 feeding via interband crossing, but more likely via MPR where the electron–phonon coupling strength decreases from Cl→Br→I. No strong relation was found between composition and the quantum efficiency (QE) of the 4f13→4f13 emission, due to the presence of fluctuations that are likely caused by intrinsic differences in sample quality. Nevertheless, a 4f13→4f13 QE of up to 70% has been observed and the materials can therefore be used in luminescence solar concentrators.RST/Luminescence MaterialsChemE/O&O groe
The synthesis of monodisperse alkanes with long chains
No full textThis thesis discusses reasons for the interest in monodisperse long chain alkanes and describes attempts, past and present, to synthesise such molecules. Chapter 1 discusses why the synthesis of such molecules are important and the objectives of this project. Chapter 2 reviews the methods previous groups have devised to prepare pure samples of long chain alkanes. In particular, work carried out by Whiting et al. at Bristol, whose scheme formed the basis of the early work in Durham. Chapter 3 describes the work in Durham and improvements which were made to Whiting's method, allowing the synthesis of longer chain lengths and greater quantities of materials to be achieved. Chapter 4 provides a summary of the practical work carried out by the author. Chapter 5 gives experimental details of the work described in Chapter 4
Earth Science and Remote Sensing Applications, Vol 43, 2018, Springer
No full textChapter 1 <br><br>P.S.Jagadeesh Kumar, Tracy Lin Huan, Xianpei Li, Yanmin Yuan. (2018) ‘Panchromatic and Multispectral Remote Sensing Image Fusion using Particle Swarm Optimization of Convolutional Neural Network for Effective Comparison of Bucolic and Farming Region’, Earth Science and Remote Sensing Applications, Series of Remote Sensing /Photogrammetry, Vol. 43, pp.1-31, Springer.
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The Art of Fixing Alzheimer’s Disease [Book]
No full text<b>P.S.Jagadeesh Kumar, "Bi-directional Recurrent Neural Networks in Classifying Dementia, Alzheimer’s Disease and Autism Spectrum Disorder", The Art of Fixing Alzheimer’s Disease, April, 2019, Dorrance Publishing Co., Pittsburgh.</b><br
From soil to cell : a broad approach to plant life
No full textTitle, preface, content
Amit Kotia and Ashwani Kumar: Biodiversity of the Indian Desert and it´s Value
Kumar, Ashwani: Bioengineering of Crops for Biofuels and Bioenergy
Eisa, Sayed S., Ali, Safwat H.: Biochemical, Physiological and Morphological Responses of Sugar Beet to Salinization
Dieckmann, Sigrid, Melzer, Olaf, Bender, Ludwig: Availability of Heavy Metals in Soils and their Uptake by Vegetable Species
Schäfer-Menuhr, Angelika: Preservation of old potato varieties
Bhojwani, Sant S., Pande, Himani, Raina, Anupam: Factors affecting androgenesis in Indica rice
Zárate, Rafael, Yeoman, Michael M.: Application of recombinant DNA technology to studies on plant secondary metabolism
Krikorian, Abraham D.: Novel applications of plant tissue culture and conventional breeding techniques to space biology research
Kumar, Ashwani: Ayurvedic medicines: Some potential plants for medicine from India
Asafova, Elena, Timofeeva, Olga, Olinevich, Olga, Khokhlova, Ludmilla: The influence of calcium and low temperatures on Oryzaline-induced reactions of wheat roots - Physiological and biochemical aspects
Groß, Ulrich: Rubisco : easy purification and immunochemical determination
Arnholdt-Schmitt, Birgit : Genomic instabilities in tissue culture - a physiological normality?<br
Ashish Kumar 2.pmd
No full textABSTRACT Kinetic investigation in Ru(III) catalyzed oxidation of D(+)-galactose and lactose in an alkaline solution of potassium bromate in the presence of mercuric acetate as a scavenger for Br -ion has been carried out in the temperature range 30-45°C. The rate shows first order dependence with respect to the bromate and zeroth order with respect to the substrate (sugars). The reaction exhibits first order dependence on the catalyst ruthenium(III) and there is inverse order on the rate of reaction. Potassium chloride and acetic acid have a positive effect on the rate. Negligible effect of change in Hg(OAc) 2 , ionic strength of the medium and D 2 O. [RuCl 3 (H 2 O)OH] -1 and BrO 3 -are the most reactive species Ru(III) chloride and bromated, respectively. Galactonic acid and lactobionic acid have been identified as the main oxidation products of the reaction. Various activation parameters have bee calculated and recorded. On the basis of experimental findings, a suitable mechanism consistent with the observed kinetics was proposed and the rate law has been derived on the basis of obtained data
Peramalan Jumlah Pajak yang Diterima oleh Pemerintah Kabupaten Deli Serdang pada Tahun 2019-2020
No full textPeramalan adalah suatu kegiatan yang memperkirakan apa yang akan terjadi pada masa yang akan datang. Pajak mempunyai peranan yang sangat penting dalam kehidupan bernegara, khususnya didalam pelaksanaan pembangunan karena pajak merupakan sumber pendapatan Negara untuk membiayai semua pengeluaran termasuk pengeluaran pembangunan. Dalam penelitian ini akan membandingkan metode kuadrat terkecil, metode trend moment dan metode semi rata-rata untuk mengetahui jumlah pajak yang diterima oleh pemerintah kabupaten Deli Serdang Pada Tahun 2019-2020. Tujuannya adalah untuk mengetahui metode yang terbaik untuk meramalkan jumlah pajak di kabupaten Deli Serdang serta mengetahui keakuratan metode kuadrat terkecil, metode trend moment dan metode semi rata-rata dalam meramalkan jumlah pajak. Berdasarkan penelitian yang dilakukan oleh penulis, bila dibandingkan metode kuadrat terkecil, metode trend moment dan metode semi rata-rata dapat disimpulkan bahwa metode kuadrat terkecil lebih baik dibandingkan dengan metode trend moment dan metode semi rata-rata. Sehingga dengan menggunakan metode kuadrat terkecil, peramalan dapat dilakukan dengan sederhana dan menghasilkan output yang lebih akurat. Akurasi metode kuadrat terkecil untuk peramalan dengan nilai RMSE 22.125.394.311 dan MAPE 0,19% sangat baik jika dibandingkan dengan metode trend moment untuk peramalan dengan nilai RMSE 22.125.411.090 dan MAPE 0,28% dan metode semi rata-rata untuk peramalan dengan nilai RMSE 295.117.831.369 dan MAPE 47,04%.Forecasting is an activity that predicts what will happen in the future. Tax has a very important role in the life of the state, including in development because taxes are a source of state income to finance all expenses including development expenditure. In this study, we will compare the least squares method, trend moment method and semi-average method to find out the amount of tax received by Deli Serdang regency government in 2019-2020. The aim is to find out the best method for forecasting the amount of tax in Deli Serdang district and knowing the accuracy of the least squares method, the trend moment method and the semi-average method in forecasting tax amounts. Based on the research conducted by the author, when compared to the least squares method, the trend moment method and the semi-average method can be concluded that the least squares method is better than the trend moment method and the semi-average method. So that by using the least squares method, forecasting can be done simply and produce more accurate output. The accuracy of the least squares method for forecasting with the value of RMSE 22.125.394.311 and MAPE 0.19% is very good when compared with the trend moment method for forecasting with the value of RMSE 22.125.411.090 and MAPE 0.28% and the semi-average method for forecasting with values RMSE 295,117,831,369 and MAPE 47.04%.58 HalamanKertas Karya Diplom
Data for figures in Kemp, E M, J W Wegiel, S V Kumar, J V Geiger, D M Mocko, J P Jacob, and C D Peters-Lidard, 2021: A NASA-Air Force precipitation analysis for near-real-time operations. Submitted to _J Hydrometeor_
No full text<p>Tar files containing gridded metrics, domain-wide metric means and confidence intervals, and rain-gauge reports used to generate figures in Kemp et al (2021).<br>
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Citation:<br>
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<p>Kemp, E M, J W Wegiel, S V Kumar, J V Geiger, D M Mocko, J P Jacob, and C D Peters-Lidard, 2021: A NASA-Air Force precipitation analysis for near-real-time operations. Submitted to _J Hydrometeor_.</p>
Study Decay 132Cs Nuclear Structure 132Xe
No full textForam estudados os decaimentos BETA-, BETA+ e por captura de elétrons do 132 Cs. Foram medidas misturas multipolares E2/M1 de transições pelo método de correlação angular direcional gama-gama. Foi aplicado o modelo de Bohr na formulação K. Kumar e M. Baranger ao 132 Xe e os resultados são discutidos.The 132 Cs BETA-, BETA+ and electron capture decays have been studied. New gamma transitions and electron capture feedings were determined. Some E2/M1 multipole mixings of gamma transitions in 132 Xe and 132Ba were measured with the gamma-gamma angular directional correlation method. The Bohr\'s collective model with K. Kumar and M. Baranger\'s solution was applied to 132 Xe and the results were discussed
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